Tension device for shears.



J. J. CONWAY.

TENSION DEVICE FOR SHEARS.

APPLIGATION FILED AUG. 17, 190s.

997,464. v Patented 1380.22, 1908.

UNITED STATES 'PATENT OFFICE,

JOHN .'r. CONwY, or BRIDGEPORT, CONNECTICUT, AssieNoR To THE ACME snnAR COMPANY, or BRTDGEPORT, CONNECTICUT,A A CORPORATION or CONNECTICUT,

TENSION DEVICE FR SHIEARS.

Specification of .Letters :Pate-nt.

Patented Dec. 22, 1908.

` Application filed Augnst 17, 1958. Serial No. @$8,845.

Tension Device for Shears, of which the following is a specication This invention has for its object to provide a simple and inexpensive adjustable tension device lior shears that will enable the Operator to provide atwill any required amount of tension upon the blades that may be required to adapt them for various uses and to compensate for the Wear of use.

With these and other objects in view I have devised the novel tension device of which the following description in connection with the accompanying drawing isa specication, reference characters being used to indicate the.v several parts.

Figure 1 is a plan view of a pair of shears rovided withmy novel tension device; and

ig. 2 is an with.

10 and 11 denote Ythe blades of a pair of edge view corresponding there- Shears, and 1? the pivot which passes freely through both blades and is provided upon oneend with a head 13. The pivot is made longer than the combined thickness of-the blades and instead of being headed down in the usual manner projects outward i'rom the Outer face of the blade forming a hub which is specifically indicated by 15. This hub is provided with a transverse hole 16 lwhich receives the end of the spring, indicated by 17.

The spring is curved to form a bearing 18 which rests upon the outer face of one of the blades and is provided at its other end with an eye 19 through which-a threaded rod 2G passes. The inner end of this rod is firmly set in one of the blades. l A set nut 21 engaging this roll. bears upon the outer face of the eye. By turning the set nut inward Or outward on the rod, the operator is enabled to apply any required amount of tension to the blades, it being obvious that tightening the set Yiut will cause the blades to be clamped more or less tightly between the bearing portion of the spring and the head the pivot, which asv already stated pasi.-...\ freely through both blades.

Having thus described my invention, claim: l.

The combination with the blades of shear of a stud passing `freely through both bla and having at one end a head, the other end extending beyond the outer face of one of the blades and provided with a transverse hole, a spring one end of which passes through the hole in the hub the other end being provided with an eye and said spring being provided intermediate its ends with a bearing portion engaging the blade, a threaded rod lixedly set in the blade and passing through the eye, and a set nut engaging said rod and bearing on the outer face of the eye.

In testimony whereof I ad my signature',- in presence of two witnesses.

JOHN J. CONWAY. Witnesses:

A. M. WoosTER, S. W. ATHERTON. 

